package com.hot100;

public class Solution02 {
    public ListNode addTwoNumbers(ListNode l1, ListNode l2) {
        int count = 0;
        ListNode head = new ListNode(-1);
        ListNode cur = head;
        int tmp;
        while (l1 != null || l2 != null) {
            int x = l1 == null ? 0 : l1.val;
            int y = l2 == null ? 0 : l2.val;
            tmp = x + y + count;
            count = tmp / 10;
            tmp = tmp % 10;
            cur.next = new ListNode(tmp);
            cur = cur.next;
            if (l1 != null) l1 = l1.next;
            if (l2 != null) l2 = l2.next;
        }
        if (count != 0) cur.next = new ListNode(count);
        return head.next;
    }
}
